<form method="post" action="{:U('Product/type_edit_save')}">
    <div style="height: 300px; width:350px; overflow-y: scroll; margin: 3px 0px 10px 0px;">
        {$tree}
    </div>
    <input type="hidden" name="uid" value="{$uid}" />
    <button type="submit">保存</button>
</form>